The Mastic Doctor team standing beside their branded vans outside an office building
Kent · England

Commercial sealant contractors in South Street, Kent

We carry out sealant work for offices, shops, hotels and other commercial buildings in South Street. Send details for a fixed quote.

  • Mouldy silicone around WCs, urinals and vanity tops
  • Water staining near frames, panels or ceilings
  • Hardened, chalky sealant on south-facing or exposed elevations
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
CHAS accredited
£5m PL insurance

Commercial sealant contractors for businesses in South Street

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Commercial sealant contractors in South Street, done properly

Mastic Doctor has been sealing joints for businesses and contractors since 2005, and the paperwork side is in order: CHAS accredited, Constructionline member, five million pounds of public liability insurance and CSCS-carded applicators. Let us know which site documents you need and they’ll be confirmed with the quote. The enquiries we see most involve frame mastic that has hardened and come away from the wall and smeared sealant across finishes from a rushed job, across external facade joints, kitchen worktops and splashbacks and movement joints in walls and floors. Whether you call it commercial sealant work, mastic application or joint sealing, in South Street it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.

On a typical commercial building in South Street, the joints that fail first are the hardest-worked ones: south-facing perimeters, entrance thresholds and busy washrooms.

A job in a smaller place like South Street is typically a single building. We’ll want a full list and photographs first, so the right products come on the day and nothing waits for a second trip.

We stand behind the joints we seal: 12 months, guaranteed. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
South Street (ME13)
Region
Kent
Guarantee
12 months on every job
Price
Fixed quote, scope in writing
Call
01277 525 020
Updated
3 November 2026

Doing it in-house

Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.

Putting right a botched joint often costs more than sealing it well at the start, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.

Your questions answered

Is South Street too far out for you?

Not at all. South Street is within our area. We cover Greater London and the counties of the South East. Send photographs and a list of what needs doing, and we will plan the job to need as few trips as possible.

Can you supply sealant in our brand colour for a site in South Street?

Yes, we can usually get close to most finishes from the product’s colour range. Available colours for the product are confirmed with the quote.

Which site documents can you send us?

Send your site requirements with the enquiry, and we will confirm the RAMS, insurance and CSCS details with the quote. From you, we will need the asbestos information for older buildings and any site rules.

Do you work for facilities managers and managing agents?

Yes, and through main contractors too. We quote, schedule and report back in the way that suits your process.

Are you CHAS accredited?

Yes. Mastic Doctor is CHAS accredited and a Constructionline member, which helps with supplier vetting.

Will your applicators have CSCS cards?

Yes. We use CSCS-carded applicators, as many construction sites ask for.

Is it OK to apply fresh sealant over existing beads?

Removal of the failed sealant is always part of the job. New sealant can’t grip the old bead, so laying over it never lasts, and the faces are brought back to sound, dry material before resealing.

Aftercare for building managers

To get the most from the new sealant:

  • Put external and wet-area joints on a regular inspection round
  • Act on the first lifting edges rather than waiting
  • Keep barriers up until the new sealant has cured
  • Keep washroom and kitchen extraction working

Add the resealed joints to your planned maintenance inspections. A periodic look catches splits and lifting edges early. Should something look amiss, you can call the office on 01277 525 020 or email the details over and send a picture.

Sealant rarely fails all at once across a building. The first failures are often a warning about the rest. We’ll tell you which sealant joints need doing first and which can wait.

Different surfaces, different methods

Movement joints in walls and floors

Movement joints in walls and floors let the structure expand and contract. When the seal fails, debris gets in and the joint stops working. The new sealant is chosen for the movement and, on floors, the traffic.

Facade and cladding joints

Panel joints on cladding and rendered facades open and close with the temperature. They need a sealant with the right movement capability, laid at the right depth. Access, such as scaffold already up, is agreed before the price is fixed.

Frontages, fit-outs and joints in South Street

South Street is in the South East, one of the UK’s drier regions. External joints still need dry faces and the right temperature, and damp or frosty mornings can hold work up. South Street lies roughly 47 miles out from central London. The South East around the capital has large numbers of business parks, offices and retail centres, especially around the motorway corridors. Occupiers with several premises in the region tend to prefer one contractor and one point of contact.

For premises near Selling station, less than half a mile to the south-west of South Street, footfall is part of the plan: work is phased so shops and offices keep trading.

South Street is about 3 miles south-east of Preston, in Kent. Businesses, contractors and managing agents in South Street use us for work on sealant joints, as part of our coverage of Kent. South Street is one of 931 places in Kent on our list for sealant joints. London is covered too, some 47 miles away.

We take on sealant joints across the ME13 postcode area. Streets here include North Lane and South Street, and sites on any of them can send details for a fixed quote. Sites close to South Street are covered too, including Crouch (1 mile north-west), Oversland (1 mile east), Neames Forstal (1 mile south-west), Hickmans Green (1 mile north-east) and Winterbourne (1 mile east). Further afield, our area takes in Ashford (10 miles south), Canterbury (6 miles east), Sittingbourne (10 miles north-west), Whitstable (6 miles north-east), Faversham (3 miles north-west) and Herne Bay (10 miles north-east).

Near you in South Street

Recent enquiries here include premises near Mount Ephraim Gardens and The Sondes Arms, among other places. There’s a railway station in South Street itself: Selling station. Other landmarks nearby include Eastbridge Hospital of St Thomas the Martyr (5.7 miles east) and Tower keep castle at Chilham (2.8 miles south). The countryside around South Street includes Blean Woods RSPB Reserve.

Map of South Street © OpenStreetMap contributors

How the quote is worked out

These are the things that shape the price:

  • Any access equipment needed
  • Travel to remote or island sites
  • Specialist products, such as fire-rated or hygienic sealants
  • Working within restricted access windows

Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.

What to include in your enquiry

The more we know, the firmer the quote. When you get in touch, include:

  • Any specification or named product
  • Where the site is, with the postcode
  • Whether the building will be occupied during the work
  • Whether an asbestos survey exists

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, ring 01277 525 020 or email drawings and photos.

What we’re called out for in South Street

Outside, sunlight and rain wear sealant down year after year. UV hardens the surface while wind and rain work at the edges. Once it stiffens, the joint opens up at the next big temperature swing.

If one of these sounds familiar, it’s time for a closer look:

  • Leaks that seem to come through a sealant line
  • Wall and floor joints that have lost their seal
  • External beads that have gone brittle and cracked
  • Sanitary sealant that has gone black and patchy

For a hotel such as Cave Hotel and Golf Resort, 1 mile to the north of South Street, the colour of a joint at the bar or the bath matters to the look of the room.

Questions to ask before you book

  • Which product they’ll use, and why it suits the joint
  • Is depth set with backing rod, or bond-breaker tape in shallow joints?
  • Will RAMS and insurance details be available?
  • Whether primer will be used where the manufacturer specifies it

Questions to ask before you appoint anyone

Diagnose, treat, sign off

In a busy building, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed before we move to the next. For a building around South Street, tell us how to find it and who will meet us. Send that with the details and we’ll confirm the plan with the quote.

  1. First, details come to us: photos, drawings or a schedule of the areas.
  2. We work out why the joints have failed and fix a quote for the agreed scope.
  3. We plan around your site hours and access windows, phasing the work where areas have to stay in use.
  4. We strip the failed bead and prepare both faces of the joint.
  5. Backing and primer go in where needed, then the chosen sealant is applied and tooled.
  6. Each area is inspected, signed off and backed by our 12-month guarantee.

Getting the site ready

  • Warn occupants and staff about the work
  • Send asbestos survey details if the building is pre-2000
  • Agree which areas must stay open

Quotes

Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to call the office on 01277 525 020 or send details through our quote form.

Get a price

Related advice

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